2QQA:
reference: Role of the N-Terminal Helix in the Metal Ion-Induced Activation of the Diphtheria Toxin Repressor DtxR., D'Aquino JA, Lattimer JR, Denninger A, D'Aquino KE, Ringe D, Biochemistry. 2007 Oct 23;46(42):11761-11770. Epub 2007 Sep 29. PMID: 17902703

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